Here is the full list of all 41 Pentiment achievements.
End Act I in the abbot's favor.
Get Lucky executed.
Convince Gernot to let you dig up the grave.
Learn about Artemis and Apollo's frog plan.
Get Martin killed.
Get Hanna killed.
Refuse to shoot at the deer.
Discover the imposter.
Get knocked out.
Win everyone's money at Lansquenet.
Lose everything at Lansquenet.
Complain to Niko about your room.
Convince Jacob Estler to save Ottilia's home.
Get Matilda executed.
Get Ottilia executed.
Get Wojslav to let you into the cellar.
Seduce Zdena.
Headbutt Werner.
Finished Act 3.
Cut enough cookies for everyone at the Christmas feast.
Learn the mystery of the cats.
Get assistance climbing down the mine shaft.
Pass 5 dialogue checks.
Examine 10 flowers.
Finished Act 2.
Get Guy killed.
Get Aedoc his medicine.
Do your penance.
Shoot the deer.
Convince Endris to find his sweetheart.
Finished Act 1.
End Act I out of the abbot's favor.
Get Ferenc executed.
Tell Jacob Estler immaterial gossip.
Have your hat stolen.
Pet 5 animals.
Spin wool as fast as the ladies.
Encourage Paul to draw.
Solve Ferenc's cipher with the volvelle.
Convince Illuminata to give you the French book.
Find the secret door to library.